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Wojciech Dyda, Katarzyna Kolacz, Michal Miller, Narcyz Blocki, Zbigniew Jaroszewicz, Marek Rekas; Evaluation of optical properties of the intraocular lenses damaged in vitro with Nd:YAG laser.. Invest. Ophthalmol. Vis. Sci. 2017;58(8):2731.
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© ARVO (1962-2015); The Authors (2016-present)
Nd:YAG (neodymium-doped yttrium aluminium garnet) laser capsulotomy is a routinely performed procedure for posterior capsule opacification. It often results in damage of intraocular lens optics. The purpose of this study is to evaluate impact of Nd:YAG induced intraocular lens damages on the optical properties of these lenses.
Intraocular lenses made of different types of materials were used in this study. Nd:YAG laser induced damages were performed on these lenses in a cross-like and circular fashion to simulate possible damages which can happen during capsulotomy procedure. All measurements were performed on specially designed optical bench. Measured parameters included MTF (modulation transfer function) and contrast (using USAF 1951 resolution test chart). These parameters were firstly measured for a new lens and later for gradually damaged lenses. All measurements were taken with a green light (546nm) and 3.0mm pupil diameter.
Comparison of modulation transfer function and contrast measurements on defocus for new lenses and damaged lenses revealed no significant differences. Figure 1 presents MTF of hydrophobic intraocular lens before and after performing damages to the lens material.
Presented methods allow evaluation of optical properties of damaged intraocular lenses. The Nd:YAG laser induced damages of the lens material did not cause significant changes in optical properties measured with MTF and contrast on defocus. Presented preliminary results suggest that Nd:YAG laser damages to intraocular lens material do not affect performance of the lens. Further study, including among others light scattering measurements, is needed to support this statement as well as influence of the affected lenses onto the vision quality.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
Figure 1. Modulation transfer function of acrylic hydrofobic intraocular lens before and after performing damages.
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